Details | Last modification | View Log | RSS feed
| Rev | Author | Line No. | Line |
|---|---|---|---|
| 1 | - | 1 | || FILE: #0052.PLD |
| 2 | || PROJ: 20120500 |
||
| 3 | || PART: G26CV12-#0052 |
||
| 4 | || |
||
| 5 | || DEV : GAL26CV12 |
||
| 6 | || |
||
| 7 | || DESC: DECODER I/O |
||
| 8 | || |
||
| 9 | | |
||
| 10 | |GAL26CV12 |
||
| 11 | | |
||
| 12 | || INPUT |
||
| 13 | | 1:A4, 2:A5, 3:A6, 4:A7, 5:A8, 6:A9, 8:A10, 9:A11, 10:A12, |
||
| 14 | | 11:A13, 12:A14, 13:A15, 14:A16, 15:A17, 16:A18, 17:A19, 18:A20, |
||
| 15 | | 25:A21, 26:A22, 27:A23, 28:VMA, |
||
| 16 | || OUTPUT |
||
| 17 | | 19:IO2, 20:DBE, 22:IO1, 23:IO0, 24:NC |
||
| 18 | | |
||
| 19 | | ACTIVE-LOW: IO0, IO1, IO2 |
||
| 20 | | |
||
| 21 | | |
||
| 22 | | SIGNATURE: "0052 " |
||
| 23 | | |
||
| 24 | || -------------------------------------------------------- |
||
| 25 | || /IO0 -> BANCO 0 - AREA 00FC10 - 00FCFF |
||
| 26 | || /IO1 -> BANCO 0 - AREA 00FD00 - 00FDFF |
||
| 27 | || /IO2 -> BANCO 0 - AREA 00FC00 - 00FC0F |
||
| 28 | || /DBE -> ABILITAZIONE BUFFER DATI BUS - SEMPRE ATTIVO ECCETTO IO2 |
||
| 29 | || -------------------------------------------------------- |
||
| 30 | || |
||
| 31 | | BANK0 = (A23' & A22' & A21' & A20' & A19' & A18' & A17' & A16' & VMA') |
||
| 32 | || -------------------------------------------------------- |
||
| 33 | || |
||
| 34 | || IOS -> 00FC00 - 00FDFF |
||
| 35 | || AREA I/O VALIDA SOLO SE VDA = 1 |
||
| 36 | | IOS = (BANK0 & A15 & A14 & A13 & A12 & A11 & A10 & A9') |
||
| 37 | || /IO1 -> AREA 00FD00 - 00FDFF |
||
| 38 | | IO1 = (IOS & A8) |
||
| 39 | || /IO2 -> AREA 00FC00 - 00FC0F |
||
| 40 | | IOLL = (IOS & A8') |
||
| 41 | | IO2X = (IOLL & A7' & A6' & A5' & A4') |
||
| 42 | | IO2 = IO2X |
||
| 43 | || /IO0 -> AREA 00FC10 - 00FCFF |
||
| 44 | | IOX0 = (IOLL & A7) |
||
| 45 | | IOX1 = (IOLL & A7' & A6) |
||
| 46 | | IOX2 = (IOLL & A7' & A6' & A5) |
||
| 47 | | IOX3 = (IOLL & A7' & A6' & A5' & A4) |
||
| 48 | | IO0 = (IOX0 # IOX1 # IOX2 # IOX3) |
||
| 49 | || -------------------------------------------------------- |
||
| 50 | || |
||
| 51 | || /DBE -> TUTTI GLI INDIRIZZI ESCLUSO IO2 |
||
| 52 | | DBE = IO2X |
||
| 53 | | NC = IO2X |